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The Contractor shall perform radiographic inspection of steel castings as
designated and as described in the section of these specifications covering
the particular item of work. The procedure for making, evaluating and
reporting the radiographic inspection shall conform to the requirements of
ASTM E 94. The castings shall be unacceptable if shown to have defects of
greater severity than the applicable reference standard specified in the
following table:
SEVERITY LEVELS
DISCONTINUITY TYPE
OR CLASSES
__________________
_______________
[_____]
[_____]
[_____]
[_____]
The applicable referenced standards shall be as illustrated in ASTM E 446.
The evaluation of the radiographs shall be subject to approval and all
records shall become the property of the Government.
PART 3
EXECUTION
3.1
INSTALLATION
All parts to be installed shall be thoroughly cleaned. Packing compounds,
rust, dirt, grit and other foreign matter shall be removed. Holes and
grooves for lubrication shall be cleaned. Enclosed chambers or passages
shall be examined to make sure that they are free from damaging materials.
Where units or items are shipped as assemblies they will be inspected prior
to installation. Disassembly, cleaning and lubrication will not be
required except where necessary to place the assembly in a clean and
properly lubricated condition. Pipe wrenches, cold chisels or other tools
likely to cause damage to the surfaces of rods, nuts or other parts shall
not be used for assembling and tightening parts. Bolts and screws shall be
tightened firmly and uniformly but care shall be taken not to overstress
the threads. When a half nut is used for locking a full nut the half nut
shall be placed first and followed by the full nut. Threads of all bolts
except high strength bolts, nuts and screws shall be lubricated with an
approved lubricant before assembly. Threads of corrosion-resisting steel
bolts and nuts shall be coated with an approved antigalling compound.
Driving and drifting bolts or keys will not be permitted.
3.1.1
Alignment and Setting
Each machinery or structural unit shall be accurately aligned by the use of
steel shims or other approved methods so that no binding in any moving
parts or distortion of any member occurs before it is fastened in place.
The alignment of all parts with respect to each other shall be true within
the respective tolerances required. Machines shall be set true to the
elevations shown.
3.1.2
Blocking and Wedges
All blocking and wedges used during installation for the support of parts
to be grouted in foundations shall be removed before final grouting unless
otherwise directed. Blocking and wedges left in the foundations with
approval shall be of steel or iron.
SECTION 05055A
Page 28